urogenital sinus

noun

plural urogenital sinuses
1
: the ventral part of the embryonic mammalian cloaca that is formed by the growth of a fold dividing the cloaca where the hindgut and allantois meet and that eventually forms the neck of the bladder and some parts of the urinary and reproductive systems
2
: a rare urogenital abnormality in which the urethral and vaginal tracts open into a common channel and share a single opening

Word History

First Known Use

1868, in the meaning defined at sense 1

Time Traveler
The first known use of urogenital sinus was in 1868

Dictionary Entries Near urogenital sinus

Cite this Entry

“Urogenital sinus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/urogenital%20sinus. Accessed 7 Feb. 2023.

Medical Definition

urogenital sinus

noun
1
: the ventral part of the embryonic mammalian cloaca that is formed by the growth of a fold dividing the cloaca where the gut and allantois meet and that eventually forms the neck of the bladder and some of the more distal portions of the genitourinary tract
2
: a rare urogenital abnormality in which the urethral and vaginal tracts open into a common channel and share a single opening
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!


The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
Spell It

Hear a word and type it out. How many can you get right?

TAKE THE QUIZ
Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?

PLAY